Damper for stoves, ranges, &amp;c.



Patented ont. 2|, |902. ICK. on s o Es, Muses, an.

' 'uAmPEn F (Application med M' (No Model.)

- JVrmawp Burda Inventar:

morn/ey UNITED STATESv PATENT OFFICE.

NORMAN BURDICK, OF ALBANY, NEW YORK.

A- DAIVIPER FOR STOVESJ RANGES,'&C.

sPEcIrIcATIoN forming para of Letters Patent-,viva 711,653,61ateaoctober 21, 1902. Application filed May 14, 1901. Serial No. 60,151.(llo model.)

.To a/ZZ whom t may concern:

Be it known that LjNoRMAN BUEDICK, a citizen of the United States,residing at Albany, in the county of Albany and State of New York, haveinvented new and useful'Improvements in Dampers-for Stoves, Ranges,&;c'., of which the following isa specification.

My invention relates to improvements in a damper employing" anair-admission plate whichV is provided with a suitable perforationhaving in it one or more internal screw-threadengaging projections,formed of sheet-tin and cast metal, of said plate, fused to the exteriorside of the said shell and adapted to engage with the screw-thread of anoperating-spindle, which also freely works through a suitableperforation provided in a fiatwisemoving damper-plate for carrying ittoward and from said air-admission plate, and also relates to asheet-tin shell of novel construction which adapts it to be readilyplaced in a sand mold, so as to become a part of the same in the sandand become a part of the said air-admission plate when cast; and itconsists in certain novel features of construction of parts andcombinations and arrangements of parts, as hereinafter set forth, andpointed out in the claims.

The object of this invention is to remedy certain defects and obviatedifficulties attending the construction of some of the parts of a damperand to facilitate the production and assemblage of the operating partsin thisclass of dampers. I attain these objects by means of the elementsand parts shown in the accompanying drawings, forming a part of thisspecification, in which- Figure 1 is an elevation in sectionv of aspindle-engaging shell which I employ as one of the elements in thisinvention. Fig. 2 is a plan of the same. section of said shell. cationin section of the same. Fig. 5 is a section of a pattern of theair-admission plate with the shell in place therein and between thenowel and cope of the mold and ready to be parted for removal of thepattern. Fig. 6 is a'section'of the two parts of the mold in place, withthe shell in place in the mold and ready to receive the molten metal.Fig. 7 is a section of the air-admission plate after being cast, havingthe spindle-engaging shell y Fig. 3 is a modification'in- Fig. 4 isanother modi.

united therewith by its partial fusion with the cast metal ofthe'said'plate. Fig. Sis a plan of the damper air-admission plate,having the spindle-engaging shell formingwa portion of the same latterplate and having certain adjuncts combined with the damper and air-admission plate; and Fig. 9 is a section taken at line'l in Fig. 8. vf

The same letters of reference referto similar parts4 throughoutthe-several views.

In the drawings, Ais a door-plateor other plate of a stove or range,which plate may be of any form of construction suitable to enter intothe structu re of the stove or range.

B is the air-admission plate, which may be an integral portion of a doorof the stove or range or a fixed plate of the same and may berectangular, circular, or other form, as' may be preferred. In thisplate B are provided suitable air-ad mission openings b b, (shown bydotted lines in Fig. 8,) and is also provided with one or moreguidingperforations b. (Shown in Fig. 9 and indicated by dotted lines inFig. 8.)

C is a hot-air-deflecting plate, which plate may beef any suitable formand proportions and suitably secured, preferably, to the airadmissionplate and having itsupper end portion closing the upper portion of the,chamber O' between air-admission plate Band saidvhot-air-deflecting.plate against the escape of air'to thecombustion-chamber (notshown) of the stove. This hot-air-deiiectingplate c is extended to a suitable distance relatively be- .low the planeof the lower ends of the air-admission openings'b, provided in the saidairadmission plate B. This hot-air-deiecting plate becomes heated by theheat reiected from the fire in the combustion-chamber, so

-as to adapt said plate to heat the air-currents passing when the damper'is open through the lair-admission openings b into the chamber C' andmoving therein in contact with said plate C and ,then discharged intothe combustionchamber C2 above the surface of the iire, (not shown,) asindicated by-arrowsin Fig. 9.

D is the damper-plate, which is solid in its body and is preferablyVprovided all around with the iianges cl d, having their edges d ttingnicely the surface a of the plate B, as shown in Fig. 9. Thisdamper-plate is pro- .full lines in Figs. 7 and 9 and indicated by videdwith one or more retaining-arms, which extend inward and enterperforations b in plate B, so as to prevent the damper-plate turning ineither direction when the spindle E is revolved.

Spindle E comprises the stem E', screwthreads e, having between theirspirals the spiral groove e', journal e2, which revolves in bearing d2in the damper-plate, shoulder es, key-form keeper e4, and handle E2 forrevolving said spindle.

The air-admission plate B is provided at a suitable place, andpreferably relatively central therein, with a suitable screw-engagingperforation B', which is preferably circular in form and havingprojected inwardly from its circumferential metal wall and toward itscenter a suitable screw-engaging projection f2, adapted to work freelyin the spiral groove e between the turns of the threads con the stem ofthe spindle E. The projection]72 may be in the forni of a screw-threadhaving two or more turns and adapted to work between those of threads eon said spindle or consist of a single turn of a screw-thread or of oneor more projections of short extension in direction of the lines ofcircumference of the perforation B, as may be had from one or moreportions of one full turn of a screw-thread for adapting the same forengagement with the screwthreads on said spindle. For producing saidspindle-receiving perforation B and the iuternal screw-engagingproject-ionfin the said air-admission plate B of suitable size, form,and location I employ a suitable shell, made of sheet-tin and comprisingthe body F, made of any suitable form, yet preferably cylindrical, andthe base-flange F', which latter is connected with the body F by thesloping portion f, running inwardly, preferably in a curved line, fromthe said base-flange to the wallf of said body of this shell. Integralwith the wallf of the body F of this shell are one or more projectionsf2, which extend inwardly from said walls to a suitable distance and ofwidth to adapt them to enter into the spiral groove e' between adjoiningspirals of threads e of the screw-threaded portion of the spindle E andso engage with the latter as to draw said spindle inwardly when itisturned in a proper direction and carry it outward when turned in anopposite direction. These screW-thread-engaging projections j"2 may bein the form of, say, two spirals, as shown in Fig. l, or of a singlespiral, as shown in Fig. 3, or in the form of one or two shortprojections of length, say, about one-sixth of the circumference of thebodyF of said shell, as shown in Fig. 4. suitable means from what isknown as sheettin,7 and when produced with the elements shown anddescribed it is adapted to form, rst, a part of the mold and, last, anintegral part of the air-admission plate B bya fusion of its outer sidesurface metal with the cast metal of said plate when in a moltencondition and receiving its form by process of molding as shown in Fig.6.

This shell may be produced by any and casting. My preferred manner ofintroducing this shell into the mold of the plate B to be cast and haveits outer surface metal fused with the metal of said plate is, brieiiy,this: Apattern P, Fig. 5, of plate B is provided with a perforation p,into which the shell is placed, when the two halves of the mold of sandwill be rammed up in the usual manner practiced by the trade. When theparts of the mold are separated, the pattern P will be removed, leavingthe shell B in place, preferably with its base-flange F down, The twoparts of the mold will noW be brought together, as shown in Fig. 6, whenthe molten metal for casting plate B will be poured in the usual manner,and the molten metal, flowing to and surrounding the body of the shelland covering the iange of the same, will by its heat fuse the exposedsurface metal of said shell, so as to fuse with the cast metal of plateB. When removed from the mold, this plate B will embody in its structurethe said shell (which latter will now be united with the cast-metalportion) and Will be a completed article, finished for use withoutcorework and without employment of drills and taps and labor andexpense, While the diameter of the spindlereceiving perforation B nowproduced, as shown in Fig. 7, will have exact correspondence with thosechambers in every other one of the many produced in similar plates bymeans of like shells, while the screw-engag-A ing projections f2 will beeach in form, finish, and size in exact correspondence with thoseproduced by use of like shells, While the entrance of the outer end ofthe stem of the spindle E into the perforation B will be facilitated bythe sloping portionfof the shell. These shells may have their respectivechambers filled with sand and be well packed with sand prior to beingplaced in the pattern for molding, or they may be packed with sand inthe process of molding by ramming mo1dingsand in the chamber of theshell While ramming up the lower or upper half of the mold. The spindleE may be made and finished for use with this shell-producedspindle-receiving perforation, which is produced by means abovedescribed, by any preferred means.

By the employment of the above-described spindle-engaging shell incombination with the air-admission plate B when the latter is fused withthe former in process of being cast, as described I obviate thenecessity of employing drills and taps for providing a suitable spindleengaging perforation in said plate B for reception of a nicely-fittingscrewthreaded stem of the spindle and also obviate the use of sand coreswhich might be employed'for producing the necessary spindleengagingperforations in this class of dampers. By the use of this shell I amenabled to produce in each plate B a spindle-engag ing perforation whichwill be in exact correspondence with those in every one of the otherplates which may be cast from the same pat- ICO IIO

tern and also be in correspondence with the screw-threaded stems ofspindles of llike diameter and screw-threads, so that any one of suchspindles may nicely fit in the spindlereceiving perforation of any ofsaid plates B, and thereby obviate all liability of said spindle anddamper-plate thereon to drop or sag under' the Weight of saiddamper-plate when the spindle is carrying the same, and, further, bythis invention air-admission plates having each a like spindle-receiving perforation are provided with similar screw-thread-engaging projectionf2, shown and described, solely by casting and in a rapid manner and atsmall expense as compared with those produced by corework or by drillingand tapping.

Having described my invention, what I` claim, and desire to secure byLetters Patent, is-

1. A spindle-engaging shell of sheet-tin comprising a cylindrical body,having internal screw-engaging devices which are adapted to enter thespiral groove of a screw-threaded stem of a revolving spindle, and aradial baseflange which is adapted to prevent said shell from shiftingwithin the sand mold of the plate to be cast and in which said shell isto be fused with the metal of such plate in the. time the castingthereof is made, and havingv its annular corner joining said body withsaid base-ange made with a curved flaring form which may be adapted toguide the entrance -end of a spindle to a passage within the chamwardthe axis of the said shell, and adapted to freely work in the spiralgroove between adjoining spiral threads of said spindle, and a radialbase-Hangs adapted to prevent said shell from shifting in the sand moldof the plate in which said spindle is to be revolved, and having aiiaring form of entrance from the base-flange to the chamber of saidshell, I

substantially asset forth.

3. The combination with an air-admission plate having in it aspindle-engaging devicel which projects inward toward the axis of acircular chamber and from a wall of thin sheet metal which is fused withthe metal of said spindle-engaging device and is also fused with `thecast metal of said air-admission plate, and v adlnission plate and alsohaving its spiral groove, provided between the spiral threads of itsstem, nicely receiving and holding with the inwardly-projected devicesprovided in the circular chamber of the spindle-receiving n perforationin said air-admission plate and also having a shoulder bearing on oneside of the said damper-plate, a keeper passing through said spindle andhaving bearing on the opposite side of said plate, and devices adaptedto hold the damper from revolving when the said spindle is beingrevolved, sub- 8o stantially as set forth.

NORMAN BURDICK.

Witnesses:

E. C. RIPLEY, ,p WILLIAM H. RoWLANn.

